Do you know what Labradorite is? I didn't before having a chat with Joanna Going, a former newspaper Internet guru who now spends her time making jewelry.I met Joanna at a new construction open house hosted by Linda Martin of Coldwell Banker's Winnetka North office.Joanna's name sounded familiar and, after some back-and-forth, I recalled talking to her when she was with the Boston Globe. Small world.